By simply dragging a PNG file onto the GammaSlamma icon, a new version will be created automatically with all that nasty Gamma information removed, making PNGs perfect for flash without having to hassle with levels and stripping manually.

["May 30th, 2011: Unfortunately 4 years after its inception it is increasingly 404ing. So here a link to the DMG in case you need to download it: GammaSlamma 1.1"